HEATER QUESTION?

Mar 2, 4:50 am show options


I wonder if somebody could give me some advice about a problem that I'm
having on the heater and defroster on my 1970 Cadillac Sedan DeVille.
When I turn on the heater or defroster they blow cool to lukewarm air,
and the interior of the car fills with smoke.

The obvious answer to is the heater core. However, I've had the car to
two different repair shops. They both checked the heater core, and
found nothing wrong with it. They also checked the radiator, the hoses
& clamps, as well as the exhuast system. Everything checks out normal.

Neither repair shop has a clue as to what is causing the problem.


Would appreciate any thoughts.


Wayne Allen )

'Smoke' means fire!

Sweet Antifreeze smelling fog means a bad heater core or a hose leak.

Cool to warm air means an air lock in the heater core usually on those
setups because one heater hose sometimes runs higher than the fluid
level in the rad.

Possible sources if fire can be the resistor pack that controls the
speed, the main power wire to the fan motor if the motor is worn out or
has a bad ground so it is 'dragging' and the switch itself if it gets
bad connections over the years.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wrote:
>
> Mar 2, 4:50 am show options
>
> I wonder if somebody could give me some advice about a problem that I'm
> having on the heater and defroster on my 1970 Cadillac Sedan DeVille.
> When I turn on the heater or defroster they blow cool to lukewarm air,
> and the interior of the car fills with smoke.
>
> The obvious answer to is the heater core. However, I've had the car to
> two different repair shops. They both checked the heater core, and
> found nothing wrong with it. They also checked the radiator, the hoses
> & clamps, as well as the exhuast system. Everything checks out normal.
>
> Neither repair shop has a clue as to what is causing the problem.
>
> Would appreciate any thoughts.
>
> Wayne Allen )

> wrote in message
oups.com...
> Mar 2, 4:50 am show options
>
>
> I wonder if somebody could give me some advice about a problem that I'm
> having on the heater and defroster on my 1970 Cadillac Sedan DeVille.
> When I turn on the heater or defroster they blow cool to lukewarm air,
> and the interior of the car fills with smoke.
>
> The obvious answer to is the heater core. However, I've had the car to
> two different repair shops. They both checked the heater core, and
> found nothing wrong with it. They also checked the radiator, the hoses
> & clamps, as well as the exhuast system. Everything checks out normal.
>
> Neither repair shop has a clue as to what is causing the problem.

Hmmm -- I could be wrong -- not sure how that system operates -- if by
vacuum! -->> Perhaps a faulty diaphragm or a leak in the vacuum system that
leads into the firewall/into the cab <<A guess!



BBA